Question about 2005 Chevrolet Equinox

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My 05 equinox has a codes P0128, and P0420 can you tell me what that means?

The engine light came on and the code reader gave me the codes P0128, and P0420 I have had the catalytic convertor replaced but the light still comes on.

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Posted on Jan 02, 2017

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SOURCE: the check engine light goes

You don't mention any vehicle specific info, but the codes read as follows:

P0420 - "Catalyst Efficiency Below Threshold (Bank 1)"

P0128 - "Coolant Temp Below Thermostat Regulating Temp"

I'd guess you basic problem is the engine isn't getting hot enough in normal operation.

Try replacing the thermostat. Do be aware that you have to purge the cooling system of any trapped air for proper cooling system function. Some vehicles have 1 or more air bleed screws in the system to aid in this process.

I suspect that if you resolve the P0128 DTC, the other will go away (might have to clear the code and go thru requisite drive cycle.

Posted on Jan 02, 2011

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SOURCE: Error Code P0128 service engine light comes on intermediately

replace the thermostat.

Posted on Apr 30, 2009

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SOURCE: Chevy Blazer P0303 and P0420

Most probably and if a cat is not flowing proper is causes back preasure that can result in sticking or burned vavles,mechanic not nice by saying ignore the cat effiency code p0420.Can ussually have cat replaced at aftermarket muffler shop for approx. $200 cheaper than valve job or excessive fuel that you have used and damage that may occur to your engine.

Posted on Jun 16, 2009

jturcotte
  • 8531 Answers

SOURCE: My check engine light is on and the code that it

check your fuel pressure regulator for a torn diaphram, which can cause a rich condition. The regulator is on top of the engine connected to the fuel injector rail with a hose. There is a second gas hose and a vacuum line attached. Pull the vacuum hose off and plug the hose with a golf tee. Start the car and check to see if any gas comes out of the regulator vacuum port. If yes, replace the regulator. If not, you may want to check the oxygen sensor that is indicating poor converter performance. You might try swapping it with the other downstream sensor and clear the code to see if the code comes back to the same sensor or the same converter. Let me know if you have questions.

Posted on Dec 15, 2010

  • 14036 Answers

SOURCE: 2 codes 1) P0420 catalytic converter

possible causes for code po420 airleaks at the exhaust manifold or in the exhaust pipes,base engine problems high engine oil or coolant usage,catalytic converter is damaged contaminated or has failed,continuos engine misfire conditions or weak or low coil out put,front HO2s or rear HO2s is contaminated with fuel or moisture,rear HO2s is loose in the mounting hole,front HO2s older aged than the rear HO2s or HO2s 1 - 2 is lazy.

Posted on Mar 31, 2011

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1 Answer

My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?


0 2 sensor near the catalytic converter or

replace the catalytic converter

The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar.

Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

https://www.obd-codes.com/p0420

Feb 03, 2017 | Cars & Trucks

1 Answer

What does error code p0128 mean


This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat

Read more at: http://www.obd-codes.com/p0128
Copyright © OBD-Codes.com

Feb 04, 2015 | Cars & Trucks

1 Answer

2004 trailblazer code po128


P0128:
P0128 OBD-II Trouble Code
Technical DescriptionCoolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

What does that mean?This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

CausesA code P0128 may mean that one or more of the following has happened:

Low engine coolant level .
Leaking or stuck open thermostat .
Faulty cooling fan (running too much) .
Faulty coolant temperature (ECT) sensor.
Faulty intake air temperature (IAT) sensor .Here's a link on replacing your thermostat.

Feb 06, 2013 | 2004 Chevrolet TrailBlazer

1 Answer

Obd2 code po 128


P0128 means that your engine thermostat is more than likely faulty. The code description is engine operation below thermostat regulating temperature.

Nov 22, 2012 | 2005 Pontiac Grand Prix

1 Answer

P0128


Hi Kelly:
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

A code P0128 may mean that one or more of the following has happened:
Low engine coolant level
Leaking or stuck open thermostat
Faulty cooling fan (running too much)
Faulty coolant temperature (ECT) sensor
Faulty intake air temperature (IAT) sensor

Sometimes Autozone or Autoshop with scanner reader tools make this for free. Feel free to contact us in the previous code links.

Also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Nov 07, 2011 | 2003 Saturn VUE

2 Answers

What are these codes PO128 P1781 PO700 2004 Chev Aveo


I use a site that deals with nothing but codes for automobiles, and this is what they gave me for your year, make and model of your car. PO128 is Electrical System failure. P1781 is Engine Torque Signal Circuit, and PO700 is Engine and Cooling. If you gave me the right codes, this is the answer Chevy gave me. hope this helps

Jan 13, 2011 | 2004 Chevrolet Aveo

1 Answer

Check engine light on got a diognostic and code P0128, P0420, and P0455 popped up trying to figure out what these codes mean and what I need to fix on my car


P0128 ECT Sensor Below Thermostat Regulating Temperature

P0420 Catalyst System Bank 1 Low Efficiency

P0455 EVAP System Large Leak (0.080") Detected

For the 'P0128' your engine isn't getting up to operating temerature. This could be because of a low coolant level or your thermostat is stuck open. For 'P0420', this indicates your catalyst isn't working as well as it should. If you have a four cylinder, this will be the first cat in the system, if you have a V6, then it will be the one on the driver side. Since this code can also indicate a clogged catalyst, you should get this checked at an exhaust shop. They can do a back pressure test to see if it is clogged. For the 'P0455', this indicates you have a fuel leak from the pressure system in the fuel tank. The EVAP takes fuel from the tank that builds up pressure and stores it in a canister until you start the engine. Then it shunts this fuel into the engine to be burned.

Jan 06, 2011 | 2005 Pontiac Grand Prix

1 Answer

The check engine light goes on and then off. Had Autozone scan code and it read P0420 and P0128. Any ideas what this means?


You don't mention any vehicle specific info, but the codes read as follows:

P0420 - "Catalyst Efficiency Below Threshold (Bank 1)"

P0128 - "Coolant Temp Below Thermostat Regulating Temp"

I'd guess you basic problem is the engine isn't getting hot enough in normal operation.

Try replacing the thermostat. Do be aware that you have to purge the cooling system of any trapped air for proper cooling system function. Some vehicles have 1 or more air bleed screws in the system to aid in this process.

I suspect that if you resolve the P0128 DTC, the other will go away (might have to clear the code and go thru requisite drive cycle.

Jan 02, 2011 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

Nissan maxima 05 service engine light is on. How do I check what the code is / are?


There are many emission sensors in the car that will make the engine light come ON. Not to mention the big list of trouble codes for the engine light.


Best way to find out what's going on engine light is to have an auto-parts store hook up a engine code reader and tell you what the code means and the problem. Most auto-part store will do this for free.

Nov 09, 2009 | 2005 Nissan Maxima

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